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Getting Crystals Made Posted: Thu Apr 29, 3: I’d say this is good for 50 MHz and more, even MHz.

When the power supply is 12 Volts, the speed will be much higher as when 5 Volts is used. More experienced constructors can run up to the maximum rated clock speed for the processor 14MHz with current WDC devices.

74S Datasheet, PDF – Alldatasheet

Do you already have an account? Connect the enable pin to ground. Aug 23, 6, You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum.

Hello, Did you see my last remark in my previous post?


Adjacent rows of course have a rather high capacitance!! Oct 24, 6. The frequency will be dependend on the supplied voltage.

Результаты поиска для 74S124

This also works with the TTL chips, wich will lead to higher frequencies,but smaller adjustment range, due to the voltage range of 4. Yes, my password is: Posted by keithg in forum: AVR’s when used as a timed clock, you may see error. You could try the attached circuit using various Schmidt trigger inverters. Breadboards aren’t really good.

I remember reading about it in these forums awhile back how someone used an AVR for an excellent programmable clock source. Also the stability of a RC oscillator will be far from ideal.

Nov 17, 3. Your name or email address: But there no output shown in the oscilloscope. Oct 12, 3. Fri Apr 30, 1: Inconsistent Results with Different Chips Posted by jpanhalt in forum: Quote of the day.

Definitely do the inputs, but with CMOS logic the outputs should be driven hard enough to be a non-issue, and I’d rather not deal with the possibility of accidentally activating the device’s clamp diodes. Dec 10, 50 3. Oct 28, 0.

Nov 17, Oct 24, 4. Only for VHF television etc. I don’t remember if it was Atmel. Nov 17, 9. A few other places we discussed clock oscillators: What is the fastest speed recommended for both? Not intentionally hijacking this thread but At this speed, propagation delays and memory access times become significant and you have to spend time adding them up and ensuring you don’t exceed the CPU timings – this can get involved.


Thu Apr 29, What is the wrong with cct? Based on the national time clock signal. I’m just trying to make my digital pulse width analyzer more useful than just analyzing automotive injectors, typically uS to 4mS on an 8 cyl engine.

Modify R1 and C1 for 7s4124 frequency. Help with IC design Voltage regulator Posted by morto00x in forum: Nov 17, 4. You could even make an oscillator with a ring of three gates. What speeds do you recommend for a beginner and what speed do you recommend for someone who knows what they are doing?

Oct 2, 17, 5, It does get hot though, which means it daatsheet using quite abit of current I think about mA. You can look this.